_Java Q&A_
by Cliff Berg

// DirectoryLister.java
public class DirectoryLister extends java.applet.Applet
	implements java.awt.event.ActionListener
{
	private java.awt.TextField tf;
	private java.awt.TextArea ta;
	private java.awt.Button b;
	String[] files;
	
	public static void main(String[] args)
	{
		java.awt.Frame f = new java.awt.Frame();
		f.setSize(400, 220);
		f.show();

		DirectoryLister dl = new DirectoryLister();
		f.add("Center", dl);
		dl.init();
		dl.start();
	}
	
	public void init()
	{
		setLayout(null);
		ta = new java.awt.TextArea();
		add(ta);
		ta.setSize(300, 100);
		ta.setLocation(10, 10);

		tf = new java.awt.TextField();
		add(tf);
		tf.setSize(300, 20);
		tf.setLocation(10, 124);
		
		b = new java.awt.Button("Display");
		add(b);
		b.setSize(100, 20);
		b.setLocation(10, 154);
		
		b.addActionListener(this);

		// Attempt to get the current directory
		
		String dir = System.getProperty("user.dir");
		getListing(dir);
		displayListing();
	}

	public void actionPerformed(java.awt.event.ActionEvent event)
	{
		Object source = event.getSource();
		
		if (source == b)
		{
			System.out.println("button clicked");
			// Obtain listing for the specified directory
			
			getListing(tf.getText());
			
			// Display the listing in the text window
			
			displayListing();
		}
	}
	
	protected void getListing(String dir)
	{
		java.io.File f = new java.io.File(dir);
		files = f.list();
	}
	
	protected void displayListing()
	{
		ta.setText("");
		for (int i = 0; i < files.length; i++)
		{
			ta.append(files[i]);
			ta.append("\r\n");
		}
	}

}